Paper 1 · Research Aptitude
If a researcher selected five schools at random and then interviewed each of the teachers in those five schools, the researcher used
ASimple random sampling
BStratified random sampling
CCluster random sampling ✓ Correct
DConvenience sampling
Correct answer: (C) Cluster random sampling — Randomly selecting whole schools and studying everyone in them is cluster random sampling, so that is the answer.
Explanation
★Randomly selecting whole schools and studying everyone in them is cluster random sampling, so that is the answer.
★In cluster sampling the population is divided into natural groups, here schools.
★Some clusters are chosen at random, and then every member of the chosen clusters is studied.
★So selecting five schools at random and interviewing all their teachers is cluster random sampling.
★Simple random sampling would pick individual teachers directly from the whole population.
★Stratified sampling would sample within strata, so studying whole random schools is cluster random sampling.
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